My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
FLOOD04616
CWCB
>
Floodplain Documents
>
Backfile
>
4001-5000
>
FLOOD04616
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
1/25/2010 6:46:45 PM
Creation date
10/5/2006 12:47:21 AM
Metadata
Fields
Template:
Floodplain Documents
County
Weld
Community
Milliken
Basin
South Platte
Title
FIS - Milliken
Date
2/1/1979
Prepared For
Milliken
Prepared By
FEMA
Floodplain - Doc Type
Current FEMA Regulatory Floodplain Information
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
17
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
Show annotations
View images
View plain text
<br />4_2 Floodways <br /> <br />Encroachment on flood plains, such as artificial fill, reduces the <br />flood-carrying capacity and increases flood heights, thus increasing <br />flood hazards in areas beyond the encroachment itself. One aspect <br />of flood plain management involves balancing the economic gain from <br />flood plain development against the resulting increase in flood <br />hazard. For purposes of the National Flood Insur~uce Program, the <br />concept of a floodway is used as a tool to assist local communities <br />in this aspect of flood plain management. Under this concept, the <br />area of the lOa-year flood is divided into a floodway and a floodway <br />fringe. The floodway is the channel of a stream, plus any adj~cent <br />flood plain areas, that must be kept free of encro~chment in order <br />that the IOO-year flood be carried without substantial increases in <br />flood heights. As minimum standards, the Federal Insurance Adminis- <br />tration limits such increases in flood heights to 1.0 foot, provided <br />that hazardous velocities are not produced. <br /> <br />The floodway for the Little Thompson River was computed on the <br />basis of equal conveyance reduction from each side of the flood plain. <br /> <br />The results of these computations are tabulated at selected cross <br />sections for each stream segment for which a floodway is computed <br />(Table 2)_ <br /> <br />AS shown on the Flood Boundary and Floodway Map (Exhlbit 2), the <br />floodway boundar~es were determined at cross sections; between cross <br />sections, the boundaries were interpolated. In cases where the <br />floodway and laO-year flood boundaries are close together, only the <br />floodway boun&ary has been shown. <br /> <br />The area between the floodway and the boundary of the lOO-yefrr flood <br />is termed the floodway fringe. The floodway fringe thus encompasses <br />the portion of the flood plain that could be completely obstructed <br />without increasing the water-surface elevation of the IOO-year flood <br />more than 1.0 foot at any point. Typical relationships between the <br />floodway and the floodway fringe and their significance to flood <br />plain development are shown in Figure 2. <br /> <br />6 <br />
The URL can be used to link to this page
Your browser does not support the video tag.